Question

when sodium chloride is had added to a definite volume of water and stirred well a solution is formed but there is no increase in the level of water why

Answer 1

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Here is your answer

As salt is a soluble solute it gets dissolved in the water (solvent) which does not increase in the level of water.

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Answer 2

we know  that there is intermolcular space in liquids . therefore when we mix salt in water it occupies the space which is taken by the intermolcular space present in liquids and so the level of water does not increases.